Simultaneous Analysis of High-Precision Electrostatic Charging on Particles Caused by Work Function with Electric Field Control and Particle Movement in Multiple Fields

本文从理论和实验两方面研究了一种表征摩擦带电粒子与壁面反复接触的新方法。采用冷凝器模型来描述颗粒的带电情况。在实验中，被送入振动板上的颗粒可以在表面上运动，并使用法拉第杯测量颗粒上的电荷。用带变焦镜头的高速摄像机观察了振动板上的颗粒行为。结果表明，颗粒电荷分布随振动板上的距离或颗粒-壁面接触数的变化规律与理论符合得很好，这是由两个与平衡和松弛有关的参数决定的。研究还发现，用外加电场获得的参数值可以很好地表征粒子的摩擦带电。

A new method for characterizing particles triboelectrically charged through repeated contact with a wall has been studied both theoretically and experimentally. The condenser model was applied to formulate the particle charging. In the experiment, particles that were fed on a vibration plate could travel on the surface, and the charge on the particles was measured using a Faraday cup. Particle behavior on the oscillating plate was observed using a high-speed camera with a zoom lens. It was found that the profile of particle charge as a function of distance travelled on the vibrating plate or the number of particle-wall contacts agreed well with the theoretical one, which is determined by two parameters related to equilibrium and relaxation. It was also found that particle tribocharging is well-characterized by the values of the parameters obtained by external electric fields.